Open Loop VE IAT Multiplier Values

[oztracktuning]

What values is everyone finding suits the B0014 Table.
I think i may have been thinking i would have to correct the wrong direction? So i have set mine back to 1.00 at the moment.

Can some people share their numbers for this table.

[Tordne]

I have had a brief play with this a while ago.. All mine are currently set to 1 at the moment as well.

The numbers will likely be different for everyone. For example, if your VE is dialled in at say 30*C IAT and someone else's is dialled in at 20*C IAT then the point at which your B0014 table will be 1.00 is different to start with.

Basically my approach to this was to get my VE dialled in at a particular IAT temp range (i.e >= 25 & < 35 would be working in only the 30*C IAT cell). Once that is done I made a map that mirrored the B0014 table and then used a filter to select Fuel Trim 22 cells (cause they should be more stable than decel etc.) and used the averaged BEN factor as the data. My thought was that I could copy this data straight into the table because hopefully the 30*C IAT cell would be 1.00 and say 20*C IAT might be 0.98 ad 40*C IAT might be 1.01, all for examples.

Hope that helps?

Cheers,

[GMPX]

I have mine set to 1.00 as well, it seems to be an issue when you hit 50+degC IAT's, i.e, like a blown car.

Cheers,
Ross

[Tordne]

I have mine set to 1.00 as well, it seems to be an issue when you hit 50+degC IAT's, i.e, like a blown car.

Cheers,
Ross

HA! I can get 50*C IAT sitting at a light for a while, and this is in Auckland let alone somewhere real hot (like Australia). I previously had a metal intake tube as well and actually recorded IAT temps in excess of 70*C IAT .

I think my next mod is going to be an OTRCAI, the cam is just going to have to wait

[BowlingSS]

I have my table set to stock also. I read one member changed his by 1% every 10 d.

Bill

[oztracktuning]

Someone quoted that for every 11*F changes air density 1% then every 10 deg C has a change of 1.6% density. So maybe the number that we need is going to be about 1.6% difference every 10 degrees.

I have mine set at 2% every 10 deg C at the moment and its getting close - but i think i now need to tweak the ECT multiplier table as well.

[GMPX]

HA! I can get 50*C IAT sitting at a light for a while, and this is in Auckland let alone somewhere real hot (like Australia). I previously had a metal intake tube as well and actually recorded IAT temps in excess of 70*C IAT .

I think my next mod is going to be an OTRCAI, the cam is just going to have to wait

Ah, you still have the factory heat box.....err I mean air box?.
OTRCAI is good, but it doesn't 'sound' as nice as a cammed motor!.

Cheers,
Ross

[Tordne]

Ah, you still have the factory heat box.....err I mean air box?.
OTRCAI is good, but it doesn't 'sound' as nice as a cammed motor!.

Cheers,
Ross

I actually have a Kosteci airbox with a K&N pod filter, and now a carbon fibre/fibreglass intake tube. Actual air deliver is really good and possibly won't by hugely improved upon, but the IAT temps are killing me. I am recording into the 50*C IAT range and it just takes ages for the IAT's to recover, and they usually only recover to as low as perhaps 35*C. Ambient temp in Auckland is approx. 25*C, so there is a huge difference.

Prior to the carbon intake tube I was logging temps into the 70*C range .

Hopefully I'll be getting a OTRCAI soon (next few weeks), just trying to decide which one.

[McRat]

Just rambling about IAT's in general.

Often the true IAT has nothing to do with what the sensor tells the engine. Sitting on the line in the summer, a Z06 will report over 150degF to the engine when the air going into the engine is only 80 deg.

If cannot relocate your IAT sensor outside the engine bay, you should at least zero out any effects that are in the "stupid range". Anything over 90 degF should probably be ignored. For racing, I zero out all effects of IAT.

The difference it made in 1/4mi ET was .48 seconds.

[oztracktuning]

Doesnt IAT and ECT effect the VE tables effects anyway? Maybe im wrong but i thought that was we needed the correction tables??

You are right the IAT heat soaked can say the airs much hotter than it really is. This is an issue.